Allegro Flexbak® Back Support, Small (26" to 36")Flexbak helps reduce back stress and strain with a design so unique its patented. Its three part support is the key to a system that provides maximum back support with ease of movement. Because no two bodies are exactly the same, this 9 medical style truss uses two internal support panels above and below the waist surrounded by an elastic third panel. These combine to produce maximum bracing without pinching or riding up. Available in four sizes.